Simplify by combining similar terms:
19). 8a + 4b - 6a - 3b + 5 =
20). 2x
2
+ 3x + 4x
2
+ 2x =
21). 2 nickels + 3 dimes + 5 quarters + 6 nickels + 3 dimes + 5 quarters =
22). 8 shirts + 4 coats - 6 shirts -3 coats + 5 sweaters =
What is the next number in these sequences?
23). 1, 2, 4, 7, 11, 16, _____
24). 1, 4, 9, 16, _____